Chromosome pairing in triploid and tetraploid hybrids in Elytrigia (Triticeae; Poaceae)

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Abstract
Mean chromosome pairing of 5.14I + 1.28II (rod + 3.86II (ring) + 147III + 0.11IV (open) + 0.11V was observed in pollen mother cells at metaphase I in the triploid hybrid E. scirpea (K. Presl) Holub, 2n = 4x = 28 .times. E. bessarabica (Savul. et Rayss) Dubrovik, 2n = 4x = 14. Mean chromosome pairing of 3.71I + 2.29II (rod) + 1.82II (ring) + 2.64III + 0.29IV (open) was observed in the triploid hybrid E. curvifolia (Lange) Holub, 2n = 4x = 28 .times. E. brssarabica. Mean chromosome pairing of 3.00I + 0.93II (rod) + 1.57II (ring) + 1.36III + 1.79IV (open) + 1.14IV (closed) + 0.79V was observed in the tetraploid hybrid E. junceiformis Loeve et Loeve, 2n = 4x = 28 .times. E. curvifolia. The first hybrid provides the first evidence by genome analysis that E. bessarabica possesses a genome (designated Eb) which is closely related to the genomes of E. scirpea (ES and ESC) and hence to the E genome of E. elongata (Host) Nevski, 2n = 2x = 14. The second and third hybrids provide the first evidence that the 2 genomes of E. curvifolia (designated EC and ECU) are related to the Eb genome of E. bessarabica and to the E gemome of E. elongata.

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